Journal of Materials Science: Materials in Electronics

, Volume 28, Issue 18, pp 14010–14018 | Cite as

Study of TiO2/ITO/ZnO:Al/p-Si photo-sensitive structure based on nanoparticles

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Abstract

By coupling sol–gel and RF sputtering techniques we have been fabricated a photo-sensitive structure: TiO2/ITO/ZnO:Al/p-Si. The electrical conduction shows a thermal assist tunneling process, involving a thermal activation energy about 130 meV. According to thermionic emission, the barrier height was found to increases with the rise of temperature. Such behavior was attributed to the effect of the presence of a Gaussian distribution of barrier heights at the ZnO:Al/p-Si interface. The mean-value of the barrier height (φb = 735 mV) was determined using the modified Richardson plot \(\ln \left( {\frac{{{\text{I}}_{{\text{s}}} }}{{{\text{T}}^{2} }}} \right) - \frac{{({\text{q}}\upsigma _{0} )^{2} }}{{2({\text{k}}_{{\text{B}}} {\text{T}})^{2} }}\) versus 1/T. This value was in good agreement with the potential barrier height deduced from C–V measurements. The photovoltaic effect was studied in the 80–300 K temperature range. The open-circuit volateg (Vco) was found about 180 mV. The temperature dependence of Vco illustrates the effect of interface states in the Vco−losses. The short-circuit current (Jsc) is found to be about 2.2 mA/cm2, which allowed as to present for photo-current sensitive application, instead of photovoltaic application. The temperature dependence of Jsc shows a negative temperature coefficient about −4.75 µA/K. This decrease was attributed to the rise of diffusion and tunnel current through the potential barrier induced by an interfacial oxide layer at the ZnO/p-Si interface.

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • M. Nouiri
    • 1
  • Z. Ben Ayadi
    • 1
  • K. Djessas
    • 2
  • L. El Mir
    • 1
    • 3
  1. 1.Laboratory of Physics of Materials and Nanomaterials Applied at Environment (LaPhyMNE), Faculty of Sciences in GabesGabes UniversityGabesTunisia
  2. 2.Laboratoire Procédés, Mathématiques et Energie Solaire (PROMES-CNRS)Université de Perpignan, Rambla de la thermodynamiquePerpignan CedexFrance
  3. 3.Departement of Physics, College of SciencesAl Imam Mohammad Ibn Saud Islamic University (IMSIU)RiyadhSaudi Arabia

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